In some types of research the target population might be as broad as all humans, but in other types of research the target population might be a smaller group such as teenagers, pre-school children or people who misuse drugs.
It is more or less impossible to study every single person in a target population so psychologists select a sample or sub-group of the population that is likely to be representative of the target population we are interested in.
This is important because we want to generalize from the sample to target population. The more representative the sample, the more confident the researcher can be that the results can be generalized to the target population.
One of the problems that can occur when selecting a sample from a target population is sampling bias. Sampling bias refers to situations where the sample does not reflect the characteristics of the target population.
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An ion (hydrogen ions, H⁺) gradient has potential energy which can be used for making ATP. Because of the proton gradient, H⁺ will diffuse from an area with higher proton concentration to an area with lower proton concentration. ATP synthase is the enzyme which allows protons to pass through the membrane and uses the free energy difference to convert ADP into ATP.
The p<span>roton gradient is made by electron transport chain which pumps H</span>⁺<span>.</span>
Answer:heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic).
Explanation:
The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.
Answer:
below shown. the figure labels and names.
